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to support manifest lists and oci image indexes, push by digest support is required. when a client pushes a manifest list, they will first push each sub-manifest and its blobs, then finally push the manifest list. a connection between an image and an image stream is represented via image stream tags. an image which represents a sub-manifest of a manifest list is however not directly connected to an image stream, and it doesn't have an image stream tag. because of this lack of image stream tag for images representing sub-manifests of a manifest list, the registry needs to perform a different action when faced with a push by digest. instead of creating an image stream mapping between the image stream and the image, it will simply create an image object for the sub-manifest.